Because of that dead heat, Marquette Law School pollster Charles Franklin said the governor's race could once again come down to turnout and who can sway the swayable.

Right now, there are fewer than 10 percent undecided.

"That under counts a few people who may be persuadable, who could change their mind over the course of the campaign. Those people are moderates as well as independents," Franklin said.

In the previous poll, conducted in May, Walker and Burke were also tied among overall registered voters.

The Burke campaign jumped on the numbers showing a shift in likely voters since May, giving the Democrat a one-point edge, still within the poll's margin of error.

"Wisconsin voters clearly understand that we need a new direction. They're responding to Mary's plan to create jobs and grow the economy, which is based on her experience in the private sector, so it's a very exciting day here," said Joe Zepecki of the Burke campaign.

The poll also shows differences between men and women.

Women support Burke over Walker by a 48-41 percent margin. Men favor Walker 51-41 percent.

"We believe though the grassroots will make the difference, that people going door to door, making contacts with their neighbors will ultimately be the factor in this election. And we think there's a clear choice. We're running on our record. We're proud to run on our record," Walker said.

This latest poll also looked at Walker's job performance, and once again, roughly half approve and the other half disapprove.

The latest poll of 804 registered voters was done between July 17 and Sunday.